Etymologies

(American Heritage® Dictionary of the English Language, Fourth Edition)

From Middle English altogeder, altogedere, equivalent to al- (“all”) +‎ together. Cognate with Scots awthegither ("altogether"). Compare also Old English eallġeador ("altogether"), West Frisian allegearre ("altogether"). More at together. (Wiktionary)

Examples

Locke, in particular, ruined the term altogether in English philosophical literature, where it has ceased to possess any recognized definite meaning.

It may be affirmed that the writers of the age of Louis XIV would not have used these expressions: they would never have thought of using the word "equality" without applying it to some particular object; and they would rather have renounced the term altogether than have consented to make a living personage of it.

Therefore, the word “Introduction” was dropped from its title altogether: The Diversity of Human Language-Structure and its Influence on the intellectual and spiritual Development of Mankind (Ueber die Verschiedenheit des menschlichen Sprachbaus und seinen Einfluss auf die geistige Entwickelung des Menschengeschlechts) (Berlin, 1836).